swift - 使用从超类继承的值创建字典

Question

我有多个类继承自一个类，是否可以为它们创建字典映射？所以我可以在给定字符串键的情况下引用正确的类。

let map = [String: EngineView] = [
  "google": GoogleView,
  "duckduckgo": DuckDuckGoView
]

GoogleView和DuckDuckGoView两个子类EngineView，但 XCode 抱怨：

“无法将 'GoogleView.Type' 类型的值转换为预期的字典值类型 'EngineView'”

标签： swift

Answer 1

假设GoogleView并从您那里DuckDuckGoView继承可以执行以下操作：EngineView

let map = [String: EngineView.Type] = [
  "google": GoogleView.self,
  "duckduckgo": DuckDuckGoView.self
]

用法

if let aClass = map["google"] {
    let instance = aClass.init()
}